Pressure Vessel Stress Calculations Max pressure calculations as long as 12 in diameter end caps Results Heating System Selection Insulation of Vessel
Taliaferro, Ray, Executive Producer/ PM Host has reference to this Academic Journal, PHwiki organized this Journal Pressure Vessel Stress Calculations Brian Stress calculations as long as a 5 foot Long 2 foot in diameter cylindrical pressure vessel during normal operation pressure of 150 psi Hoop Stress or Stress in the Circumferential Direction = Pr/t With P = 150 psi, r = 12 in, in addition to t = .25 in Hoop Stress = 7200 psi Axial Stress = Pr/2t With P = 150 psi, r = 12 in, in addition to t = .25 in Axial Stress = 3600 psi Max pressure calculations as long as a 5 foot Long 2 foot in diameter cylindrical pressure vessel Calculations based on Grade B pipe with a Minimum Yield Strength: 35000 psi t = .25 in r = 12 in Max Pressure based on Hoop Stress = 35000 psi Pressure = 729.17 psi Max Pressure based on Axial Stress = 35000 psi Pressure = 1458.3 psi
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Stress calculations as long as 12 in diameter spherical end caps during normal operation pressure of 150 psi. Hoop Stress = Axial Stress = Pr/2t With P = 150 psi, r = 6 in, in addition to t = .25 in Hoop Stress = 1800 psi Max pressure calculations as long as 12 in diameter end caps Calculations based on Grade b pipe with a Minimum Yield Strength: 35000 psi t = .25 in r = 6 in Max Pressure based on Hoop Stress = 35000 psi Max Pressure = 2916.7 psi Results Based on the previous calculations we have determined that the limiting factor in regard to max pressure within the pressure vessel is the Hoop Stress as long as the cylindrical pressure chamber. But it is still 3.86 times the intended operation pressure of 150 psi.
Heating System Selection Convection Incoloy Tubular Heating selected Is most common in commercial autoclaves Easily obtained used in home appliances Insulation of Vessel Prevent heat from escaping (minimize power required to heat) Keep surface temperature low to prevent burning danger Can also add outer covering, i.e. sheet metal (extra cost)
Insulation Thickness 0.4 m O.D. corresponds to a 3.5 insulation layer Common (R13) No real gains if any thicker Heating of Vessel Surface temp. at 3.5 thickness is 80F Heat loss also levels off at 3.5 Total power to maintain max. temp: ~470W Total power to heat up air at 15F/min (total 27 min): ~1.5kW Allowing as long as thermal mass of parts/molds/pipe, ~4-5 kW needed Can easily be run on 240V power Elements can be obtained to provide this Blowers inside vessel will help maintain uni as long as m temp.
Estimated Heating System Costs 63 ft^2 R13 fiberglass ($20) 4-5kW incoloy tubular heating element ($250) Potential sheet metal covering ($125) Shipping, fittings, etc ($125 est.) Subsystem estimated total: $400-$500
Taliaferro, Ray Executive Producer/ PM Host
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